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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
START
Check the TP4
NO
YES
Resolder J200
YES
Earphone will work properly
Can you hear your
voice from
the earphone?
Set the audio part of the test
Equipment to echo mode
Change the earphone
and try again
NO
Can you hear
the sound from
the earphone?
Set the audio part of the test
equipment to PRBS or
Continuous wave mode
YES
YES
Resolder TP3
CHECKING FLOW
Check the U603(LM49150)
NO
YES
Can you hear
the sound from
the earphone?
NO
Change the earphone
and try again
NO
Can you hear your
voice from
the earphone?
NO
Resolder the TP1, TP2, TP6 and TP7
Check the level of HPMIC_DET_3.5
and the path of Ear-Mic
Is JACK_DETECT_3.5
High ?
Check the TP8 and TP9
(Amp Input Power and Charge-
pump Power)
YES
NO
Check the U600(LP3907)
YES
NO
Check TP5(Low)
Check U102(AD6725)
4.10 Earphone Trouble